PART 8 — SEWAGE SYSTEMSUpdated for the 2024 Ontario Building Code
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8.7.5.2.Loading Requirements
(1) The effective area of the surface of the filter medium in each filter bed shall be at least 10 m 2 and not more than
50 m2.
(2) The area described in Sentence 8.7.4.2.(1) shall be designed such that the loading rate does not exceed, for soil
having a percolation time set out in Column 1 of Table 8.7.4.1., the maximum value set out opposite it in Column 2 of
Table 8.7.4.1.
(3) Except as provided in Sentence (5), where the total daily design sanitary sewage flow does not exceed 3 000 L, the
effective area shall be such that the loading on the surface of the filter medium does not exceed 75 L/m 2 per day.
(4) Except as provided in Sentence (5), where the total daily design sanitary sewage flow exceeds 3 000 L
(a) the effective area shall be such that the loading on the surface of the filter medium does not exceed 50 L/m 2 per day,
and
(b) the leaching bed shall be comprised of more than one filter bed, each of similar size and adjacent to each other.
(5) Where a Level II, Level III or Level IV treatment unit as described in Table 8.6.2.2. is used in conjunction with a
filter bed, the effective area shall be such that the loading on the surface of the filter medium does not exceed 100 L/m2
per day.
This provision includes a table — formatting is preserved from the source; refer to the official code for the authoritative layout.
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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.